<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>bootcss2</title>
    <link rel="stylesheet" href="static/css/bootstrap.min.css">
    <style>
        .a {
            display: block;
            height: 50px;
        }
    </style>
</head>
<body>
<div class="container">
    <button class="btn btn-default btn-lg">
        <span class="glyphicon glyphicon-star"></span>
    </button>
    <hr>
    <div class="row h3">
        <div class="col-md-3 a bg-warning text-muted">你好</div>
        <div class="col-md-9 a">
            <div class="row">
                <div class="col-md-6 bg-danger a">6</div>
                <div class="col-md-6 bg-primary a">6</div>
            </div>
        </div>
    </div>



    <div class="row">
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-primary">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-danger">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-info">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
    </div>
    <div class="row">
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-primary">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-danger">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-info">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
    </div>
    <div class="row">
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-primary">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-danger">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a bg-info">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
        <div class="col-md-1 col-sm-2 col-xs-6 a">1</div>
    </div>
</div>



<hr>
<div class="container">
    <img src="static/imgs/html_css.jpeg" class="img-rounded">
    <img src="static/imgs/html_css.jpeg" class="img-circle">
    <img src="static/imgs/html_css.jpeg" class="img-thumbnail">
</div>
</body>
</html>